Lock File Decorator

lock.py

from pathlib import Path
import time
import json
from typing import Dict

def lock_file(func):
    '''
    Decorator which 
    '''
    def wrapper(path: Path, data):
        # before writing ensure there is no lock
        assert path.exists()
        lock_path = Path(path.resolve().as_posix() + '.LCK')
        # how long we have been waiting
        wait_secs = 0
        while lock_path.exists() and wait_secs < 10:
            print(f'lock exists for {path}. Sleeping....')
            time.sleep(1)
            wait_secs += 1
            
        lock_path.touch()
        print(f'created lock file for {path}')

        # call the decorated function
        func(path, data)

        # remove the lock
        if lock_path.exists():
            print(f'Done. Removing lock for {path}. Sleeping')
            lock_path.unlink()
    return wrapper
  
@lock_file
def update_json(path: Path, data: Dict):
    with open(path, 'r') as f:
        file_json = json.load(f)
    file_json.update(data)
    with open(path, 'w') as f:
        json.dump(file_json, f)
        
@lock_file
def update_json_slow(path: Path, data: Dict):
    time.sleep(8)
    with open(path, 'r') as f:
        file_json = json.load(f)
    file_json.update(data)
    with open(path, 'w') as f:
        json.dump(file_json, f)